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    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
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    <script>
      // 变量声明
      let age;
      // 变量赋值
      age = 18;
      // 变量使用
      console.log(age);

      // 声明的同时直接赋值，变量的初始化
      let name = "张三";
      // 重新赋值
      name = "李四";

      // 声明多个变量
      let a = 1,b = 2,c = 3;
      console.log(a, b, c);
    </script>
  </body>
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